Steel tube girder in a combination cross section
By welding M12 screws into φ48 steel pipes and fixing C-shaped 6.3# channel steel, a composite section steel pipe main beam is formed, which solves the problem of insufficient bending resistance and deflection of traditional steel pipe main beams, and achieves savings in material and labor costs and tooling improvements.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU FUDASHIJI CONSTRUCT ENG CO LTD
- Filing Date
- 2025-05-27
- Publication Date
- 2026-06-19
AI Technical Summary
When the lateral spacing between the uprights on both sides of a traditional frame beam exceeds 600 mm, the steel pipe main beam at the bottom of the beam cannot meet the calculation requirements for bending performance and deflection, which necessitates the addition of uprights and top supports, increasing material and labor costs.
The main steel pipe beam adopts a composite section form. M12 screws are welded inside ordinary φ48 steel pipes, and C-shaped 6.3# channel steel is fixed with matching nuts to form a composite section, which enhances bending resistance and deflection, and avoids the need to add a middle upright.
Without adding a central upright, it improves bending resistance and deflection, saves material and labor costs, and achieves a composite improvement through tooling.
Smart Images
Figure CN224379406U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of steel pipe main beam technology, and in particular to a steel pipe main beam with a composite cross section. Background Technology
[0002] Composite cross-section steel pipe main beams are mainly used in formwork support systems. When traditional frame beams use wooden formwork support systems, the load transfer mainly goes from wooden formwork → square timber secondary beams → ordinary 48 steel pipe main beams → uprights. When the lateral spacing between the uprights on both sides of the beam exceeds 600mm, even if the beam cross-section is as small as 200×400mm, the steel pipe main beam at the bottom of the beam cannot meet the calculation requirements for bending performance and deflection. In this case, it is necessary to add an upright and top support in the middle of the bottom of the beam to support the steel pipe main beam at the bottom of the beam, which increases material costs and erection labor. Summary of the Invention
[0003] This utility model aims to solve the problem that the existing technology of steel pipe main beams at the bottom of beams cannot meet the calculation requirements for bending performance and deflection. In this case, it is necessary to add a vertical pole and a top support in the middle of the bottom of the beam to support the steel pipe main beam at the bottom of the beam, which causes the increase in material costs and construction labor. This utility model provides a steel pipe main beam with a composite cross section.
[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: This composite cross-section steel pipe main beam includes a steel pipe and a channel steel. The steel pipe is located on the inner wall of the channel steel. The upper and lower sides of the outer wall of the steel pipe are welded and fixed with screws. The screws penetrate the interior of the channel steel. The outer end of the screw is threaded with a matching nut. The outer wall of the matching nut abuts against the channel steel.
[0005] To further improve the design, a fillet weld is machined at the connection between the steel pipe and the screw.
[0006] To further improve the design, the inner walls of the channel steel are machined with through holes on both the upper and lower sides for the screw to pass through.
[0007] Further improvements were made, specifying that the channel steel is C-shaped 6.3# channel steel.
[0008] The beneficial effects of this utility model are as follows: This utility model, through the cooperation between channel steel, screw, steel pipe and matching nut, enables the 6.3# channel steel to be connected to the ordinary φ48 steel pipe as a whole through the screw. By strengthening the combined cross section of the steel pipe main beam at the bottom of the beam, the cross section modulus, moment of inertia and other parameters of the steel pipe main beam within the load range are improved. Without increasing the middle upright of the bottom of the beam, the bending performance and deflection deformation of the steel pipe main beam at the bottom of the beam can meet the calculation requirements. The composite main beam of the steel pipe at the bottom of the beam is mainly formed by the composite of ordinary φ48 steel pipe and 6.3# channel steel. By welding M12 screw on the φ48 steel pipe and tightening the matching nut, the two are firmly connected to form a whole. Compared with the prior art, this case has the following advantages: (1) When the cross section of the general beam is less than 0.27㎡, the middle upright and top support materials at the bottom of the beam are saved, saving material costs and erection labor; (2) The composite improvement using the traditional ordinary φ48 steel pipe and 6.3# channel steel can form a tool. Attached Figure Description
[0009] Figure 1 This is a bottom view of the structure of this utility model;
[0010] Figure 2 This utility model Figure 1 A schematic diagram of the split structure in the diagram;
[0011] Figure 3 This utility model Figure 1 A top-down structural diagram.
[0012] Explanation of reference numerals in the attached drawings: 1. Steel pipe, 2. Channel steel, 3. Screw rod, 4. Matching nut, 5. Fillet weld. Detailed Implementation
[0013] The present invention will be further described below with reference to the accompanying drawings:
[0014] See attached document Figure 1-3 In this embodiment, a composite cross-section steel pipe main beam includes a steel pipe 1 and a channel steel 2. The steel pipe 1 is located on the inner wall of the channel steel 2. The steel pipe 1 is a common φ48 steel pipe. The upper and lower sides of the outer wall of the steel pipe 1 are welded and fixed with screw rods 3. The screw rods 3 penetrate the interior of the channel steel 2. The screw rods 3 are M12 screw rods. The outer end of the outer wall of the screw rod 3 is threaded with a matching nut 4. The outer wall of the matching nut 4 abuts against the channel steel 2. A fillet weld 5 is processed at the connection between the steel pipe 1 and the screw rod 3. The fillet weld 5 is the trace of the welding connection between the steel pipe 1 and the screw rod 3. The upper and lower sides of the inner wall of the channel steel 2 are processed with through holes for the screw rods 3 to pass through. The channel steel 2 is a C-shaped 6.3# channel steel.
[0015] Working principle:
[0016] When this composite section type of steel pipe main beam is required, this case starts by improving the material of the steel pipe main beam at the bottom of the beam. By connecting the 6.3# channel steel 2 to the ordinary φ48 steel pipe 1 through the screw 3, the composite section type of the steel pipe main beam at the bottom of the beam is strengthened, and the section modulus, moment of inertia and other parameters of the steel pipe main beam within the load range are improved. Without adding the vertical poles in the middle of the bottom of the beam, the bending performance and deflection deformation of the steel pipe main beam at the bottom of the beam can meet the calculation requirements. Of course, when the frame beam section is ≤0.27㎡ (300×900), the composite steel pipe main beam at the bottom of the beam can be fully utilized, saving the vertical poles and top added in the middle of the bottom of the beam. When the beam section exceeds 0.27㎡ (300×900), the bottom of the beam still needs to be arranged with a corresponding number of vertical poles.
[0017] The composite main beam with steel pipe at the bottom is mainly formed by ordinary φ48 steel pipe 1 and 6.3# channel steel 2. M12 screw rod 3 is welded on φ48 steel pipe 1 and the two are firmly connected to form a whole by tightening the matching nut 4.
[0018] Compared with existing technologies, this case has the following advantages:
[0019] (1) When the cross section of a general beam is less than 0.27㎡, the materials for the uprights and top supports at the bottom of the beam are saved, thus saving material costs and labor for erection.
[0020] (2) By using traditional ordinary φ48 steel pipe and 6.3# channel steel for composite improvement, tooling can be formed.
[0021] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail are possible within the scope of the claims.
Claims
1. A composite cross-section steel pipe main beam, comprising a steel pipe (1) and a channel steel (2), wherein the steel pipe (1) is located on the inner wall of the channel steel (2), characterized in that: The steel pipe (1) has screws (3) welded and fixed on both the upper and lower sides of its outer wall. The screws (3) penetrate the interior of the channel steel (2). The outer end of the screw (3) is threaded with a matching nut (4). The outer wall of the matching nut (4) abuts against the channel steel (2).
2. The composite cross-section steel tube girder according to claim 1, characterized by: The connection between the steel pipe (1) and the screw (3) is provided with a fillet weld (5).
3. The composite cross-section steel tube girder according to claim 1, characterized by: The inner walls of the channel steel (2) are machined with through holes on both the upper and lower sides for the screw (3) to pass through.
4. The composite cross-section steel tube girder according to claim 1, characterized by: The channel steel (2) is a C-type 6.3# channel steel.